Glossary
What is manifest v3?
The current extension platform rules for Chrome.
Manifest V3 replaced long-lived background pages with service workers that shut down when idle, so extension state must be persisted rather than held in memory.
It also bans remotely hosted code: everything that executes must ship inside the reviewed package.
For users the practical effect is tighter permissions and more predictable behaviour about what an extension can reach.
In practice
An extension that needs to check something on a schedule uses the alarms API, because its worker will not stay running.
Common questions
- What does manifest v3 mean in one sentence?
- The current extension platform rules for Chrome.
- Why does manifest v3 matter when you use Claude or ChatGPT?
- For users the practical effect is tighter permissions and more predictable behaviour about what an extension can reach.
- Can you give an example of manifest v3?
- An extension that needs to check something on a schedule uses the alarms API, because its worker will not stay running.
Related terms
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